20216128927 has 4 divisors (see below), whose sum is σ = 20558775240. Its totient is φ = 19873482616.

The previous prime is 20216128913. The next prime is 20216128943. The reversal of 20216128927 is 72982161202.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20216128927 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20216128927.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20216128327) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 171323068 + ... + 171323185.

It is an arithmetic number, because the mean of its divisors is an integer number (5139693810).

Almost surely, 2^20216128927 is an apocalyptic number.

20216128927 is a deficient number, since it is larger than the sum of its proper divisors (342646313).

20216128927 is an equidigital number, since it uses as much as digits as its factorization.

20216128927 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 342646312.

The product of its (nonzero) digits is 48384, while the sum is 40.

The spelling of 20216128927 in words is "twenty billion, two hundred sixteen million, one hundred twenty-eight thousand, nine hundred twenty-seven".